Never mind I found out it is not HFDI but HFD1 and it has to do with the usb and eathernet connection on the formater board
I have been looking at some phaser 7760s for sale on the net and sometimes I see the following posted
" Xerox Phaser 7760 HFDI " as the model what does the "HFDI" indicate or mean ?
Thanks
Bobby